如何修改 cisco asa 5510 telnet 连接的用户名和密码？

在ASA 5510的#模式下没有Telnet ；
Cisco pix and asa 不支持telnet到其他的设备；
因为安全因素，以下文档你可以参考：

You cannot Telnet to an ASA - from the outside interface unless the traffic is ipsec protested
I suggest you use SSH (secure Telnet) which is east to setup
to enable SSH you need to do the following..............
Allow SSH to PIX / ASA
First allow an IP address (Or network)
eg
ciscoasa(config)#ssh 217.22.123.123 255.255.255.255 outside
Then (Only do this once) Create an RSA key on the Firewall
ciscoasa(config)# crypto key generate rsa
INFO: The name for the keys will be:
Keypair generation process begin. Please wait...
Ciscoasa(config)#

The first time is connects it will give you a warning about
trusting the other end accept it.
The username is pix
The Password is the Firewalls telnet password
Note: The telnet password is set to cisco by default change it
using the
passwd command
ciscoasa(config)#passwd newpassword.

不能设置！